MCP servers that ship as code — a repository or a package you install and run locally (usually over stdio). They have no hosted endpoint, so we cannot probe or grade them: instead each one shows its repository, install command, license, stars and when it was last updated.
Collected from GitHub repositories and npm, PyPI, Cargo, Go, Maven, NuGet and RubyGems packages tagged as MCP servers, the official MCP Registry, Docker's MCP catalog, ModelScope, Baidu MCP World, Cline and other public directories; one entry per repository. A server that also offers a hosted endpoint is listed under Remote instead. These entries are not counted in our reachability, verification or readiness statistics.
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MCP server that calls your real API and checks the response against your OpenAPI spec — contract testing, auth presets, spec diffing, and health checks for Claude Code, Cursor, and Windsurf.
MIT -
OpenAPI testing and deterministic API fuzzing for AI agents—catch contract bugs before unsafe calls with local-first sealed plans, MCP, and replayable evidence.
Apache-2.0 ★ 2 -
specmatic-mcp-servergithub.com/specmatic/specmatic-mcp-serverupdated this year
A Model Context Protocol (MCP) server that exposes Specmatic's contract testing capabilities to AI coding agents like Claude Code. This server enables comprehensive API contract validation and mock server management for development workflows.
MIT ★ 12 -
GSA Per Diemno update data
MCP server for GSA Per Diem Rates. Federal travel lodging and M&IE rates for IGCEs, travel CLINs, and contractor travel cost estimation. Look up rates by city, state, or ZIP across all CONUS locations. Returns monthly lodging rates with seasonal variations, M&IE breakdowns, and first/last day travel rates at 75%. **6 tools.** Optional free api.data.gov key for 1,000 req/hr. Without a key, falls back to DEMO_KEY at 30/hr, 50/day. Hardened across 7 audit rounds with 413 regression tests including two live audits. Built for GS-1102 contracting officers and proposal pricing teams.
smithery -
Catch breaking OpenAPI/REST API changes in CI before they reach production
MIT ★ 3 -
@machina.ai/openapi-contract-testerupdated this year
MCP Server for comprehensive AI-powered API testing from OpenAPI specifications
npm UNLICENSED -
MCP server that lets AI agents load an OpenAPI spec, call real endpoints, validate responses against the documented schema, run a full contract-test pass, diff two spec versions for breaking changes, and health-check a set of endpoints.
npm MIT -
tielinegithub.com/nugehs/tielineupdated this year
Static frontend↔backend contract-drift checker. Pact without writing a single contract test.
MIT -
openrungithub.com/dmedovich/openrunupdated this year
Run, validate, and automate APIs directly from OpenAPI — from the CLI, Go tests, or MCP agents.
Apache-2.0 -
Stop your AI agent from breaking your API: OpenAPI contract checks and breaking-change diffs over MCP, fully local.
npm MIT -
Detects drift in the third-party APIs your AI agents depend on, explains it, warns your agents over MCP, and opens the pull request that adapts your code.
pypi MIT ★ 1 -
Replay-verified minimal JSON reproductions and deterministic TypeScript/OpenAPI drift checks. Local-first CLI and MCP server.
MPL-2.0 ★ 1 -
Deterministic cross-language API contract verification and autonomous AST impact engine for Java Spring Boot and TypeScript/Angular/React
npm SEE LICENSE IN LICENSE -
Model Context Protocol (MCP) server for Sajimora - deterministic cross-language API contract verification and AST guard
npm SEE LICENSE IN LICENSE -
specshield-mcp-servergithub.com/specshield-io/specshield-mcp-serverupdated this year
The API-change deploy gate for AI coding agents (MCP server): is it safe to ship this API change to my consumers? Read-only, over OpenAPI/Pact.
MIT -
specshield-mcp-servergithub.com/specshield-io/specshield-mcp-serverupdated this year
SpecShield MCP server — the API-change deploy gate for AI coding agents. Ask 'is it safe to ship this API change to my consumers?' inside Claude, Cursor, and other MCP clients. Analyze-only; it never modifies code.
npm MIT